This year has been the biggest yet for online video, and for the first time we're sharing our official Most Watched lists and some of the fastest-rising search terms on YouTube. Some moments were big (President Obama's inauguration), some small (a Minnesota wedding party erupts into dance), some expected ("New Moon"), some surprising (Susan Boyle) — but all of them inspired, entertained and connected millions of people around the world via YouTube.

For these lists, we looked at view counts of YouTube's most popular videos this year (in some instances we aggregated views across multiple versions of the same video):

Then, to determine the fastest rising search terms for each month, we examined the billions of queries that people searched for on YouTube (through December 15):

Fastest Rising YouTube search terms by month (Global):

January: inauguration

February: christian bale

March: the climb

April: susan boyle

May: pacquiao vs hatton

June: michael jackson thriller

July: michael jackson

August: usain bolt

September: kanye west

October: paranormal activity

November: bad romance

December: tiger woods

Fastest Rising YouTube search terms by month (U.S.):

January: obama inauguration

February: on a boat

March: watchmen

April: susan boyle

May: pacquiao

June: michael jackson thriller

July: wedding

August: send it on

September: kanye west

October: paranormal activity

November: adam lambert

December: tiger woods

There are a lot of interesting nuggets in here. The fastest rising U.S. search term in July was [wedding], clearly related to "JK Wedding Entrance Dance," the third Most Watched YouTube video of the year. And while [michael jackson] was Google's fastest rising search term in 2009, [michael jackson thriller] was the faster rising search on YouTube. Movie trailers ("New Moon," "Watchmen," "Paranormal Activity") and inspirational moments (Susan Boyle, Usain Bolt) were popular, as were sensational celebrity scandals (Christian Bale, Kanye West and, most recently, Tiger Woods).

We hope to expand these lists in the future, so if there are any "Most Watched" categories you'd like to see in 2010, let us know by leaving a comment below.